package com.hvgroup.modules.sanic.websocket;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/websocket/get_answer/{userId}/{chatId}")
@Slf4j
@Component
public class QAWebSocketHandler {

    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static final CopyOnWriteArraySet<QAWebSocketHandler> webSocketSet = new CopyOnWriteArraySet<>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 接收sid
     */
    private String userId = "";
    private String chatId = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session
            , @PathParam("userId") String userId
            , @PathParam("chatId") String chatId) {
        this.session = session;
        //如果存在就先删除一个，防止重复推送消息
        webSocketSet.removeIf(webSocket -> webSocket.userId.equals(userId) && webSocket.chatId.equals(chatId));
        webSocketSet.add(this);
        this.userId = userId;
        this.chatId = chatId;
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来用户:[{}]会话:[{}]的信息:{}", userId, chatId, message);
        //群发消息
        for (QAWebSocketHandler item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }

    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误", error);
    }

    /**
     * 实现服务器主动推送
     */
    private void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 群发自定义消息
     */
    public static void sendInfo(QASocketQuery query) {
        String message = query.getMessage();
        log.info("收到来用户:[{}]会话:[{}]的信息:{}", query.getUserId(), query.getChatId(), message);

        for (QAWebSocketHandler item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if (query.getUserId() == null || query.getChatId() == null) {
                    item.sendMessage(message);
                } else if (item.userId.equals(query.getUserId()) && item.chatId.equals(query.getChatId())) {
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }

}
